vapoursynth-editor: fix darwin build

pkgs/by-name/va/vapoursynth/editor.nix

@@ -1,5 +1,6 @@
 {
   lib,
+  stdenv,
   mkDerivation,
   fetchFromGitHub,
   makeWrapper,
@@ -23,6 +24,11 @@ let
       hash = "sha256-+/9j9DJDGXbuTvE8ZXIu6wjcof39SyatS36Q6y9hLPg=";
     };
 
+    postPatch = ''
+      substituteInPlace pro/vsedit/vsedit.pro \
+        --replace-fail "TARGET = vsedit-32bit" "TARGET = vsedit"
+    '';
+
     nativeBuildInputs = [ qmake ];
     buildInputs = [
       qtbase
@@ -34,14 +40,25 @@ let
 
     preConfigure = "cd pro";
 
-    preFixup = ''
-      cd ../build/release*
-      mkdir -p $out/bin
-      for bin in vsedit{,-job-server{,-watcher}}; do
-          mv $bin $out/bin
-          wrapQtApp $out/bin/$bin
-      done
-    '';
+    preFixup =
+      ''
+        cd ../build/release*
+        mkdir -p $out/bin
+      ''
+      + lib.optionalString stdenv.hostPlatform.isDarwin ''
+        mkdir -p $out/Applications
+        for bin in vsedit{,-job-server{,-watcher}}; do
+            mv $bin.app $out/Applications
+            makeQtWrapper $out/Applications/$bin.app/Contents/MacOS/$bin $out/bin/$bin
+            wrapQtApp $out/Applications/$bin.app/Contents/MacOS/$bin
+        done
+      ''
+      + lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
+        for bin in vsedit{,-job-server{,-watcher}}; do
+            mv $bin $out/bin
+            wrapQtApp $out/bin/$bin
+        done
+      '';
 
     passthru = {
       inherit withPlugins;